Methods for the comminution of botanical feedstock

ABSTRACT

A method for treating  cannabis  comprises treating a feedstock of  cannabis  and obtaining treated feedstock comprising comminuted  cannabis ; pneumatically conveying the treated feedstock to a cyclonic separator; and, subjecting the treated feedstock to a first cyclonic separation stage and obtaining a first stream of treated feedstock separated out of a fluid stream by the first cyclonic separation stage and a first fluid stream having a reduced level of treated feedstock.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No.15/791,183, filed on Oct. 23, 2017, herein incorporated by reference inits entirety for all purposes.

FIELD

This disclosure relates generally to apparatus and methods for thecomminution of botanical feedstock. More specifically, this disclosurerelates to apparatus and methods for the comminution of cannabis and thecollection and/or separation of comminuted cannabis.

INTRODUCTION

The following is not an admission that anything discussed below is partof the prior art or part of the common general knowledge of a personskilled in the art.

Blade grinders are typically used to chop and mix a material using arelatively high speed rotating blade. Typically, with a blade grinder(or other similar chopping methods), the particles get smaller andsmaller during the grinding process, which may make it difficult toachieve a consistent grind from batch to batch. In addition, maygrinders operate on a batch basis as opposed to a continuous basis.

SUMMARY

The following introduction is provided to introduce the reader to themore detailed discussion to follow. The introduction is not intended tolimit or define any claimed or as yet unclaimed invention. One or moreinventions may reside in any combination or sub-combination of theelements or process steps disclosed in any part of this documentincluding its claims and figures.

In accordance with one aspect of this disclosure, which may be usedalone or in combination with any other aspect, an apparatus for thecomminution of a botanical feedstock, such as cannabis, includes ascreen positioned in a vessel and a rotating blade positioned above thescreen. For example, the screen may be oriented generally horizontally(e.g., ±15° from the horizontal) and the rotating blade may be on ashaft that is oriented perpendicularly to the screen. A cutting edge ofa leading side of the blade is spaced from the screen by a firstdistance. Accordingly, pieces of botanical feedstock resting on thescreen that are large enough to extend upwardly from the screen by adistance greater than the first distance will be cut by the blade as itrotates above the screen.

The blade also has a downwardly extending trailing portion. Thistrailing portion has a lower edge having a plurality of discontinuitiesalong its radial length. An advantage of this design is that, as theblade is rotated at relatively high speeds, air turbulence generated bythese discontinuities may aerodynamically lift some or all of the piecesof botanical feedstock resting on the screen to a position above thescreen, where they may then be cut by the cutting edge of the blade asit rotates above the screen. Additionally, or alternatively, the airturbulence generated by the downwardly extending trailing portion mayaerodynamically suspend some pieces of botanical feedstock in a positionabove the screen, where they may then be cut by the cutting edge of theblade.

By providing a rotating blade with such a downwardly extending trailingportion, the apparatus may be more efficient at reducing the size of thebotanical feedstock pieces before they pass through openings in thescreen. Additionally, or alternatively, the apparatus may provide a moreconsistent size of cut botanical feedstock pieces that pass throughopenings in the screen. Improving the consistency of the size of cutbotanical feedstock (e.g. cut cannabis particles) may advantageouslyimprove further processing of the botanical feedstock. For example, amore consistent cut particle size may increase the packing density ofthe cut particles, which may improve throughput of subsequent processingof the feedstock (e.g. an extraction process to obtain a cannabisextract from cut cannabis feedstock).

Another potential advantage of this design is that the rotating blademay be spaced from the screen during its rotation, which may reduce orminimize heat generated by friction. For certain botanical feedstocks,e.g. cannabis, it may be desirable to reduce the size of feedstockpieces without unnecessarily heating the feedstock (e.g. by crushing orshearing), as such heating may degrade or otherwise alter the chemicalstructure of one or more components or compounds in the feedstock (e.g.trichomes, terpenes).

In accordance with this broad aspect, there is provided an apparatus forthe comminution of a botanical feedstock, the apparatus comprising:

-   -   (i) a vessel having a top and a bottom, the bottom comprising a        first feedstock outlet;    -   (ii) a screen positioned in the vessel above the first feedstock        outlet and spaced from the top of the vessel, the screen having        an upper surface and a lower surface; and,    -   (iii) a blade rotatably mounted above and generally parallel to        the screen and configured to be rotated in a direction of        rotation, the blade having a leading side, a trailing side in        the direction of rotation and a radial blade length between an        axis of rotation and a blade tip, at least a portion of the        leading side having a cutting edge and at least a portion of the        trailing side having a downwardly extending trailing portion,        the downwardly extending trailing portion having a lower edge        having a plurality of discontinuities along a radial length of        the trailing portion, wherein the cutting edge is spaced from        the upper surface of the screen by a first distance and a        lowermost portion of the lower edge is spaced from the upper        surface of the screen by a second distance.

In some embodiments, the plurality of discontinuities may compriseradially spaced apart downwardly extending sections of the lower edge,each section having a top and a bottom, wherein the radial extent ofeach section may narrow towards the bottom of the section and a gapbetween adjacent sections may increase towards the bottom.

In some embodiments, the lower edge may be generally saw toothed inshape.

In some embodiments, the lower edge may be generally sinusoidal inshape.

In some embodiments, the first distance may be from 31 mm to 54 mm.

In some embodiments, the second distance may be from 7 mm to 30 mm.

In some embodiments, the screen may have an aperture size of between 2mm and 15 mm.

In some embodiments, the vessel may define a volume overlying the bladesand the volume may be uninterrupted.

In some embodiments, the apparatus may further comprise a feedstockinlet in communication with the vessel and comprising an openable feedport.

In some embodiments, first feedstock outlet may be connectable in fluidcommunication with a source of negative pressure.

In some embodiments, the blade may have a rate of rotation and at therate of rotation, the downwardly extending trailing portion may beoperable to draw at least some feedstock positioned on the upper surfaceof the screen from the upper surface of the screen towards a plane ofrotation of the cutting edge.

In some embodiments, the downwardly extending trailing portion mayextend at an angle of between 30 degrees and 60 degrees to the plane ofrotation.

In some embodiments, the apparatus may further comprise a cyclonicseparator positioned downstream from the first feedstock outlet, thecyclonic separator being in flow communication with a separated materialcollection region and a fluid outlet.

In some embodiments, the apparatus may further comprise a filterpositioned downstream from the fluid outlet.

In some embodiments, the blade may comprise a plurality of blades.

In accordance with another aspect of this disclosure, which may be usedalone or in combination with any other aspect, a method of grinding abotanical feedstock, such as cannabis, comprises rotating one or morecutting blades wherein the one or more curring blades are configured toproduce lift or turbulence to raise uncut or partially cut feedstockinto a zone in which they may be cut by the blade or blades. In oneembodiment, the grinding apparatus is operated under negative pressurewhich may produce a downwardly flow of air and feedstock andaccordingly, in such a case, the lift may be sufficient to overcome thedownward force and raise uncut or partially cut feedstock into a zone inwhich they may be cut by the blade or blades. In accordance with thisaspect, an apparatus for the comminution of a botanical feedstock, suchas cannabis, may include a vessel having a feedstock outlet in fluidcommunication with a source of negative pressure, a screen positioned inthe vessel above the outlet, and a rotatable blade positioned above thescreen. The blade has a downwardly extending trailing portion. Thistrailing portion has a lower edge having a plurality of discontinuitiesalong its radial length. A method for operating such an apparatusincludes rotating the blade at a rate of rotation sufficient for thetrailing portion of the blade to generate an upward force such as byturbulence that induces upward movement of cut and partially cutfeedstock resting on the screen despite a downward force produced by thenegative pressure.

An advantage of this method is that, as the blade is rotated, airturbulence generated by the trailing portion of the blade mayaerodynamically lift and/or suspend some or all of the pieces ofbotanical feedstock resting on the screen to a position above thescreen, where they may then be cut by the cutting edge of the blade asit rotates above the screen.

Optionally, the source of negative pressure may be activated to reducethe pressure in the vessel to below ambient pressure, and draw botanicalfeedstock (including pieces of cut and partially cut feedstock) towardsthe feedstock outlet. Preferably, at the rate of rotation, theturbulence generated by the blade may overcome a downward force on thepieces of cut and partially cut feedstock produced by the source ofnegative pressure.

Another potential advantage of this method is that pieces of cut andpartially cut feedstock (including ‘dust’ and other fine particles) maybe drawn through the screen and through the feedstock outlet by thesource of negative pressure. Optionally, cut feedstock drawn through thefeedstock outlet may be subjected to separation (e.g. cyclonicseparation wherein the source of negative pressure is downstream fromthe cyclone air outlet) and/or filtration and subsequent collection.This may reduce or minimize any loss of fine particulate matter (e.g.trichomes) which may be regarded as valuable.

In accordance with this broad aspect, there is provided a method ofoperating an apparatus for the comminution of a botanical feedstock,wherein the apparatus comprises:

-   -   (i) a vessel having a top and a bottom, the bottom comprising a        first feedstock outlet connected in fluid communication with a        source of negative pressure;    -   (ii) a screen positioned in the vessel above the first feedstock        outlet and spaced from the top of the vessel, the screen having        an upper surface and a lower surface; and,    -   (iii) a blade rotatably mounted above and generally parallel to        the screen and configured to be rotated in a direction of        rotation, the blade having a leading side, a trailing side in        the direction of rotation and a radial blade length between an        axis of rotation and a blade tip, at least a portion of the        leading side having a cutting edge and at least a portion of the        trailing side having a downwardly extending trailing portion,        the downwardly extending trailing portion having a lower edge        having a plurality of discontinuities along a radial length of        the trailing portion;    -   the method comprising:    -   rotating the blade in the direction of rotation at a rate of        rotation, wherein the trailing portion generates turbulence that        induces upward movement of cut and partially cut feedstock from        the upper surface of the screen to a plane of rotation of the        cutting edge of the blade.

In some embodiments, the method may further comprise activating thesource of negative pressure to reduce the pressure in the vessel tobelow ambient pressure, wherein at the rate of rotation, the turbulencegenerated by the rotation of the blade may overcome a downward force onthe cut and partially cut feedstock that is produced by the source ofnegative pressure.

In some embodiments, at the rate of rotation, the plurality ofdiscontinuities may produce eddy currents that draw cut and partiallycut feedstock upwardly to a plane of rotation of the cutting edge of theblade.

In some embodiments, at the rate of rotation, the rotation of the blademay neutralize a downward force on the cut and partially cut feedstockthat is produced by the negative pressure in the vessel and may providelift to the cut and partially cut feedstock.

In some embodiments, the lower edge of the downwardly extending trailingportion may be generally saw toothed in shape and at the rate ofrotation, the rotation of the blade may provide lift to the cut andpartially cut feedstock.

In some embodiments, the rate of rotation may be between 750 and 1400revolutions per minute.

In some embodiments, the vessel may define a volume positioned above theblade and the negative pressure may draw fine particulate matter fromthe volume and through the screen.

In some embodiments, the negative pressure may draw at least 75% of thefine particulate matter from the volume and through the screen.

In some embodiments, the method may further comprise withdrawing cutfeedstock from the first feedstock outlet and conveying the treatedfeedstock to a cyclonic separator.

In some embodiments, the method may further comprise subjecting a fluidstream drawn from the vessel through the first feedstock outlet tocyclonic separation thereby separating some of the cut feedstock fromthe fluid stream and collecting the separated feedstock in a separatedmaterial collection region.

In some embodiments, the method may further comprise obtaining a fluidsteam having a reduced level of cut feedstock from the cyclonicseparator and subjecting the fluid stream to physical filtration toremove fine particulate matter from the fluid steam having a reducedlevel of cut feedstock.

Typically, a batch grinder may be operated by loading the grinder with abotanical feedstock through a feed port, closing the feed port,operating the grinder with the feed port closed until the feedstock hasbeen ground, and then deactivating the grinder prior to re-opening thefeed port and introducing additional botanical feedstock to be ground.Grinding a feedstock in such ‘batches’ may have one or moredisadvantages. For example, the grinder is idle (i.e. not grindingfeedstock) while additional batches of feedstock are being loaded intothe grinder, which may reduce overall throughput.

In accordance with another aspect of this disclosure, which may be usedalone or in combination with any other aspect, a method of continuouslyoperating a batch grinder is provided. First, botanical feedstock isloaded into a vessel of the grinder. The vessel is closed and thegrinder is operated under negative pressure and a fluid streamcontaining treated feedstock is removed from the grinder. Whilecontinuing to draw air from the vessel, and while continuing to operatethe grinder, a feed port of the vessel is opened and additionalbotanical feedstock is introduced into the grinder.

An advantage of this method is that, by continuing to draw air from thevessel, pieces of feedstock (including dust and other fine particulate)may be inhibited or prevented from exiting the vessel via the feed portof the vessel. Additionally, or alternatively, by loading additionalfeedstock into the grinder without stopping and restarting the grinder,overall throughput and the uniformity of the treated feedstock may beincreased.

Another advantage is that, for cannabis, dust produced by the grindingprocess includes a fine dry resin that has been detached from the plantmaterial, which is typically considered valuable. Further, government orhealth regulations may limit the amount of such material that may be ina work environment (e.g., parts per million). By operating the grinderunder negative pressure, such dust may tend to be drawn away from a feedinlet in an upper portion of the vessel thereby enabling a feed inletport to be opened during the grinding process and untreated feedstock tobe introduced. Accordingly, the grinder may be operated on a continuousbasis.

Another potential advantage of this method is that pieces of cut andpartially cut feedstock (including ‘dust’ and other fine particles) maybe withdrawn from the grinder using the source of negative pressure.Optionally, cut feedstock drawn through the feedstock outlet may besubjected to separation (e.g. cyclonic separation) and/or filtration andsubsequent collection. This may reduce or minimize any loss of fineparticulate matter (e.g. trichomes) which may be regarded as valuable.

In accordance with this broad aspect, there is provided a method ofcontinuously operating a batch grinder comprising:

-   -   (a) introducing a botanical feedstock into a vessel of the        grinder;    -   (b) closing the vessel and operating the grinder as a closed        vessel under negative pressure and withdrawing a fluid steam        containing treated feedstock from the grinder; and,    -   (c) while continuing to operate the grinder under negative        pressure, opening a feed port of the vessel and introducing        additional botanical feedstock into the grinder while continuing        to draw air from the vessel using a source of negative pressure.

In some embodiments, the grinder may comprise a rotating blade and themethod may further comprise rotating the blade at a rate to counter adownward force applied to the feedstock in the grinder due to thenegative pressure.

In some embodiments, the grinder may comprise a rotating blade having aneddy producing trailing edge and the method may further compriserotating the blade to produce eddy currents to draw cut and partiallycut feedstock upwardly from a screen to a level of a leading edge of theblade.

In some embodiments, the method may further comprise conveying the fluidsteam containing the treated feedstock to a cyclonic separator.

In some embodiments, the method may further comprise subjecting thefluid stream containing the treated feedstock to cyclonic separationusing a cyclonic separator thereby separating some of the treatedfeedstock from the fluid stream and collecting the separated treatedfeedstock in a separated material collection region.

In some embodiments, the method may further comprise obtaining asecondary fluid steam having a reduced level of treated feedstock fromthe cyclonic separator and subjecting the secondary fluid stream tophysical filtration to remove fine particulate matter from the secondaryfluid steam.

In accordance with another aspect of this disclosure, which may be usedalone or in combination with any other aspect, an apparatus for thetreatment of cannabis is provided. The apparatus includes a grinderhaving a feedstock outlet and a source of negative pressure downstreamof the feedstock outlet. A cyclonic separator downstream of thefeedstock outlet has an inlet for receiving comminuted cannabis from thegrinder and a comminuted cannabis outlet.

An advantage of this design is that, as a cannabis feedstock is reducedto comminuted cannabis by the grinder, the comminuted cannabis may bewithdrawn from the grinder entrained in an airflow and subsequentlyseparated from the airflow using the cyclonic separator. This mayincrease the total volume of comminuted cannabis collected from thegrinding process. For example, dust and other fine cannabis particles(including e.g. trichomes, terpenes) may be drawn from the grinder andcollected following cyclonic separation. Such fine cannabis particlesmay escape to the atmosphere and/or otherwise be lost when processed ina typical ‘batch’ grinder (e.g. without a source of negative pressureand/or without a cyclonic separator).

In accordance with this broad aspect, there is provided an apparatus forthe treatment of cannabis comprising:

-   -   (i) a grinder having a feedstock inlet and a feedstock outlet;    -   (ii) a first cyclonic separator positioned downstream from the        feedstock outlet, the first cyclonic separator having a cyclone        inlet receiving comminuted cannabis from the grinder, a        comminuted cannabis outlet, and a cyclone air outlet; and,    -   (iii) a source of negative pressure downstream from the        feedstock outlet of the grinder.

In some embodiments, the source of negative pressure may be downstreamfrom the cyclone air outlet.

In some embodiments, the apparatus may further comprise a firstseparated material collection chamber downstream from the comminutedcannabis outlet.

In some embodiments, the apparatus may further comprise an extractorhaving an inlet that receives at least some of the comminuted cannabisexiting the comminuted cannabis outlet, the extractor producing acannabis extract.

In some embodiments, the apparatus may further comprise an extractorhaving an inlet that receives at least some of the comminuted cannabisfrom the separated material collection chamber, the extractor producinga cannabis extract.

In some embodiments, the grinder may further comprise:

-   -   (a) a screen positioned in a vessel above the feedstock outlet,        the screen having an upper surface and a lower surface; and,    -   (b) at least one blade rotatably mounted above the screen and        rotatable in a direction of rotation, a first blade of the at        least one blade having a leading edge comprising a cutting        portion, wherein the cutting portion is spaced from the upper        surface of the screen by a first distance.

In some embodiments, the at least one blade may have a trailing edgecomprising a downwardly extending trailing portion, the downwardlyextending trailing portion may have a lower edge having a plurality ofdiscontinuities along a radial length of the trailing portion, wherein alowermost portion of the lower edge may be spaced from the upper surfaceof the screen by a second distance.

In some embodiments, the first blade may have the trailing edge.

In some embodiments, the apparatus may further comprise a filtrationmember positioned downstream of the cyclone air outlet.

In some embodiments, the filtration member may comprise a secondcyclonic separator.

In some embodiments, the filtration member may comprise a physicalfiltration member.

In accordance with another aspect of this disclosure, which may be usedalone or in combination with any other aspect, a method of treatingcannabis is provided. First, a feedstock of cannabis is treated toobtain comminuted cannabis. The treated feedstock is conveyed to acyclonic separator to obtain a stream of treated feedstock and a fluidstream having a reduced level of treated feedstock.

An advantage of this method is that, by pneumatically conveying thecomminuted cannabis to the cyclonic separator, any loss of fineparticulate matter (e.g. trichomes) during transfer from the treatmentstage to the cyclonic separation stage may be reduced or preferablyminimized.

Another potential advantage of this method is that the fluid streamhaving a reduced level of treated feedstock may be subjected to furthertreatment (e.g. cyclonic separation or physical filtration) to increasethe overall recovery of the comminuted cannabis, including in particularthe recovery of fine particulate matter (e.g. trichomes).

Another potential advantage of this method is that comminuted cannabisobtained by cyclonic separation may be subjected to extraction to obtaina cannabis extract. Additionally, multiple cyclonic separation stagesmay be arranged in series and used to obtain treated cannabis feedstockwith different average particle sizes.

In accordance with this broad aspect, there is provided a method fortreating cannabis comprising:

-   -   (a) treating a feedstock of cannabis and obtaining treated        feedstock comprising comminuted cannabis;    -   (b) pneumatically conveying the treated feedstock to a cyclonic        separator; and,    -   (c) subjecting the treated feedstock to a first cyclonic        separation stage and obtaining a first stream of treated        feedstock separated out of a fluid stream by the first cyclonic        separation stage and a first fluid stream having a reduced level        of treated feedstock.

In some embodiments, step (a) may comprise comminuting at least aportion of the feedstock of cannabis.

In some embodiments, the method may further comprise subjecting at leasta portion of the first stream of treated feedstock to extraction andobtaining a cannabis extract.

In some embodiments, the method may further comprise collecting thefirst stream of treated feedstock exiting the cyclonic separator andsubsequently subjecting at least a portion of the collected first streamof treated feedstock to extraction and obtaining a cannabis extract.

In some embodiments, step (c) may further comprise subjecting thetreated feedstock to at least one subsequent cyclonic separation stagein series with the first cyclonic separation stage, wherein eachsubsequent cyclonic separation stage may separate treated cannabishaving a smaller particle size than the immediately previous cyclonicseparation stage.

In some embodiments, the method may further comprise subjecting thefirst fluid stream having a reduced level of treated feedstock to asecond cyclonic separation stage and obtaining a second fluid streamhaving a further reduced level of treated feedstock and treatedfeedstock separated out of a fluid stream by the second cyclonicseparation stage wherein the treated feedstock separated out of a fluidstream by the second cyclonic separation stage may have a smalleraverage particle size than an average particle size of the treatedfeedstock separated out of a fluid stream by the first cyclonicseparation stage.

In some embodiments, the method may further comprise subjecting thefirst fluid stream having a reduced level of treated feedstock to aphysical filtration stage.

In some embodiments, step (a) may comprise comminuting at least aportion of the feedstock of cannabis, and the method may furthercomprise collecting the first stream of treated feedstock exiting thecyclonic separator and subsequently subjecting at least a portion of thecollected first stream of treated feedstock to extraction and obtaininga cannabis extract.

In some embodiments, the method may further comprise subjecting thefirst fluid stream having a reduced level of treated feedstock to aphysical filtration stage.

It will be appreciated by a person skilled in the art that an apparatusor method disclosed herein may embody any one or more of the featurescontained herein and that the features may be used in any particularcombination or sub-combination.

These and other aspects and features of various embodiments will bedescribed in greater detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the described embodiments and to show moreclearly how they may be carried into effect, reference will now be made,by way of example, to the accompanying drawings in which:

FIG. 1 is a perspective view of an apparatus for the comminution of abotanical feedstock in accordance with one embodiment, with portions ofthe vessel wall shown as translucent for ease of understanding;

FIG. 2 is a top perspective view of the interior of the upper portion ofthe vessel of the apparatus of FIG. 1;

FIG. 3 is a top view of a cutting edge insert and a main blade body of ablade of the apparatus of FIG. 1 during manufacture, prior to bendingthe main blade body to create a downwardly extending trailing portion;

FIG. 4 is a radial section view of the main blade body of FIG. 3 afterbending to create the downwardly extending trailing portion;

FIG. 5 is a top view of the main blade body and downwardly extendingtrailing portion of FIG. 4;

FIG. 6 is a schematic elevation view of a screen and rotating blade ofthe apparatus of FIG. 1, with botanical feedstock being swept up as theblade is rotated;

FIG. 7 is a schematic view of an apparatus for the treatment of cannabisor other botanical feedstock in accordance with another embodiment,including a source of negative pressure, a cyclonic separator, and anoptional physical filtration member;

FIG. 8 is a schematic view of an apparatus for the treatment of cannabisor other botanical feedstock in accordance with another embodiment,including a source of negative pressure, and two cyclonic separatorsarranged in series;

FIG. 9 is a simplified process flow diagram for a method of operating anapparatus for the comminution of a botanical feedstock in accordancewith one embodiment;

FIG. 10 is a simplified process flow diagram for a method ofcontinuously operating a batch grinder in accordance with oneembodiment;

FIG. 11 is a simplified process flow diagram for a method for treatingcannabis in accordance with one embodiment;

FIG. 12 is a top perspective view of a lower end of a vessel inaccordance with another embodiment;

FIG. 13 is a top view of the lower end of a vessel of FIG. 12; and

FIG. 14 is a side view of the lower end of a vessel of FIG. 12.

The drawings included herewith are for illustrating various examples ofarticles, methods, and apparatuses of the teaching of the presentspecification and are not intended to limit the scope of what is taughtin any way.

DESCRIPTION OF EXAMPLE EMBODIMENTS

Various apparatuses, methods and compositions are described below toprovide an example of an embodiment of each claimed invention. Noembodiment described below limits any claimed invention and any claimedinvention may cover apparatuses and methods that differ from thosedescribed below. The claimed inventions are not limited to apparatuses,methods and compositions having all of the features of any oneapparatus, method or composition described below or to features commonto multiple or all of the apparatuses, methods or compositions describedbelow. It is possible that an apparatus, method or composition describedbelow is not an embodiment of any claimed invention. Any inventiondisclosed in an apparatus, method or composition described below that isnot claimed in this document may be the subject matter of anotherprotective instrument, for example, a continuing patent application, andthe applicant(s), inventor(s) and/or owner(s) do not intend to abandon,disclaim, or dedicate to the public any such invention by its disclosurein this document.

The terms “an embodiment,” “embodiment,” “embodiments,” “theembodiment,” “the embodiments,” “one or more embodiments,” “someembodiments,” and “one embodiment” mean “one or more (but not all)embodiments of the present invention(s),” unless expressly specifiedotherwise.

The terms “including,” “comprising” and variations thereof mean“including but not limited to,” unless expressly specified otherwise. Alisting of items does not imply that any or all of the items aremutually exclusive, unless expressly specified otherwise. The terms “a,”“an” and “the” mean “one or more,” unless expressly specified otherwise.

As used herein and in the claims, two or more parts are said to be“coupled”, “connected”, “attached”, or “fastened” where the parts arejoined or operate together either directly or indirectly (i.e., throughone or more intermediate parts), so long as a link occurs. As usedherein and in the claims, two or more parts are said to be “directlycoupled”, “directly connected”, “directly attached”, or “directlyfastened” where the parts are connected in physical contact with eachother. None of the terms “coupled”, “connected”, “attached”, and“fastened” distinguish the manner in which two or more parts are joinedtogether.

Furthermore, it will be appreciated that for simplicity and clarity ofillustration, where considered appropriate, reference numerals may berepeated among the figures to indicate corresponding or analogouselements. In addition, numerous specific details are set forth in orderto provide a thorough understanding of the example embodiments describedherein. However, it will be understood by those of ordinary skill in theart that the example embodiments described herein may be practicedwithout these specific details. In other instances, well-known methods,procedures, and components have not been described in detail so as notto obscure the example embodiments described herein. Also, thedescription is not to be considered as limiting the scope of the exampleembodiments described herein.

General Description of an Apparatus for Comminution of a BotanicalFeedstock

Referring to FIGS. 1 to 8, an exemplary embodiment of an apparatus forcomminution of a botanical feedstock is shown generally as 1000. Thefollowing is a general discussion of this embodiment which provides abasis for understanding several of the features which are discussedherein. As discussed subsequently, each of the features may be usedindividually or in any particular combination or sub-combination in thisor in other embodiments disclosed herein.

In the illustrated embodiment, the apparatus breaks up a botanicalfeedstock (e.g. cannabis) into smaller pieces using one or more rotatingcutting blades. The apparatus may also be characterized as a ‘bladegrinder’ or simply as a ‘grinder’.

As exemplified in FIGS. 1 to 6, apparatus 1000 includes a vessel 100having an upper end 102, a lower end 104, and a screen 120 positioned inthe vessel 100 between the upper end 102 and the lower end 104.

In the illustrated example, vessel 100 is generally cylindrical.Preferably, vessel 100 is generally round at the position of the screen120 and blade 200 (discussed further below), although it may have anysuitable shape. For example, vessel 100 may have a diameter of about 22inches.

Screen 120 has an upper surface 122, a lower surface 124, and includes aplurality of holes or other apertures 125 extending through the screenfrom the upper surface 122 to the lower surface 124. Preferably, atleast the majority of apertures 125 have the same or similar dimensions.Accordingly, particles of botanical material introduced into the vesselabove the screen (e.g. via an inlet provided in the upper end 102) thatare larger than the screen apertures will be retained by and remainabove the screen, while particles of botanical material that are smallerthan the apertures 125 are able to travel through the screen into thelower end 104 of vessel 100. Thus, the ‘grind size’ or average size ofthe particles of botanical feedstock that reach the lower end 104 ofvessel 100 is based on the size of the screen apertures 125.Accordingly, the size of the screen apertures may be selected based on adesired ‘grind size’ for the comminuted botanical feedstock. In someembodiments, the screen 120 may be a 0.25 inch square mesh screen. Insome embodiments, the screen may have a Tyler mesh size in the rangespanning 7 to 2.5. Alternatively, mesh sizes with larger openings may beused depending on e.g. an intended use for the comminuted botanicalfeedstock.

In the illustrated example, two feedstock inlets 112 are provided at theupper end 102 of vessel 100. Each feedstock inlet 112 is openable toallow a botanical feedstock to be introduced into the upper end 102 ofvessel 100. It will be appreciated that in alternative embodiments, asingle feedstock inlet 112 may be provided, or three or more inlets 112may be provided. Further, the inlets may be placed elsewhere (e.g., onan upper portion of the sidewall 110 of vessel 100).

In the illustrated example, a feedstock outlet 114 is provided in thelower end 104. It will be appreciated that in alternative embodiments,two or more feedstock outlets may be provided. Further, the one or moreoutlets may be located at any position below screen 120 and need not bein a lower portion of the sidewall of vessel 100. For example, an outletmay be provided in the lower surface of vessel 100.

FIGS. 12 to 14 (and FIGS. 7 and 8) illustrate an example of a conicallower end 104 of vessel 100 in which the sidewall 110 tapers inwardly atan angle 111 towards a feedstock outlet 114. In the illustrated example,the angle 111 of the sidewall taper is about 70°, although it may belarger or smaller in alternative embodiments. Also, in the illustratedexample the lower end 104 has an overall height 109 of about 11.4inches, an upper portion 107 of about 2.1 inches that is not tapered,and a distance 108 of about 10.1 inches from the top of lower end 104 tothe top of feedstock outlet 114. Upper portion 107 has an inner diameterof about 22 inches. It will be appreciated that other suitable designsand/or dimensions of lower end 104 may be used in alternativeembodiments.

In example illustrated in FIG. 1, feedstock outlet 114 is provided withan optional openable door 115 to allow particles of comminuted feedstockto be removed from the lower end of the vessel at selected times (i.e.,when the door 115 is opened). Also, in the illustrated example anoptional deflector plate 105 is provided to direct comminuted feedstocktowards feedstock outlet 114 and openable door 115. Deflector Plate 105may be of any configuration which directs comminuted feedstock to door115. Alternatively, a door may not be provided. For example, asdiscussed further below, feedstock outlet 114 may be an opening in thesidewall that is coupled to a conduit or otherwise in fluidcommunication with a source of negative pressure.

Apparatus 1000 also includes at least one blade 200 rotatably mountedabove screen 120. As will be discussed further below, when blade 200 isrotated, botanical material in the path of a cutting edge of the bladewill be cut by the blade, thereby reducing the particle size of thebotanical material. As noted above, once botanical material has beenreduced to a particle that is smaller than an aperture in the screen,that particle of comminuted material may travel through the screen intothe lower end 104 of vessel 100.

In the illustrated example, blade 200 is coupled to a motor 140 via adrive shaft 150. In use, motor 140 rotates the drive shaft 150, therebyrotating the blade 200. In alternative embodiments, a gearbox or thelike may be provided between the motor 140 and blade 200 to control e.g.the speed and/or torque of the blade during rotation. The motor ispreferably positioned above the blade 200, as shown in the illustratedembodiment, although it may be positioned below the blade 200 inalternative embodiments.

As exemplified, vessel 100 is shown as being vertically oriented.Accordingly, as exemplified drive shaft 150 extends vertically orgenerally vertically. It will be appreciated that vessel may be orientedsuch that drive shaft 150 is at an angle (e.g., 5°, 10°, 15°, 20°) tothe vertical. It will be appreciated that drive shaft 150 is preferablyperpendicular or generally perpendicular to screen 120. Accordingly, asthe blade rotates, it remains a relatively constant distance from theupper surface of screen 120.

As exemplified in FIG. 2, three blades 200 may be provided for cuttingbotanical feedstock. In alternative embodiments, a single blade 200, twoblades 200, or four or more blades 200 may be provided. The blades maybe equally spaced around motor shaft 150. Therefore, if three blades 200are provided, they may be spaced 120° around the motor shaft. Inalternate embodiments, they need not be equally spaced apart.

Configuration of the Cutting Blades

The flowing is a description of the configuration of blades 200 whichmay be used by itself or in combination with one or more of the otherfeatures disclosed herein including having the feedstock outlet incommunication with a source of negative pressure, the use of one or morecyclone separators and any of the methods disclosed herein.

In accordance with this aspect, blades 200 are configured to cut thefeedstock and also to draw feedstock (which may or not have been cut)upwardly from the upper surface of screen 120 and into a zone in whichit will be cut by blades 200. For example, blades 200 may be configuredto entrain or ‘sweep up’ feedstock and direct the feedstock upwardlytowards a plane of rotation of the cutting edge 210 of blade 200.

As exemplified in FIG. 6, blade 200 has a leading side 202 that precedesa trailing side 204 when blade 200 is rotated in its forward directionof rotation 30. A cutting edge 210 is provided along at least a portionof, and preferably along most or substantially all of, the leading side202, so that botanical feedstock impacted by the blade will be cut orotherwise reduced in size. Cutting edge 210 preferably has a sharpenedsurface 211 positioned at the forward extent of leading side 202, suchthat when blade 200 is rotated in its forward direction of rotation,cutting edge 210 will likely be the initial point of contact betweenblade 200 and botanical feedstock positioned in the path of blade 200.

In the illustrated example, cutting edge 210 is formed on separatecutting edge insert 215 that is mechanically fastened to a main bodyportion 250 of blade 200 using bolts inserted through apertures 216 incutting edge insert 215 and apertures 218 in main body portion 250.Alternatively, cutting edge insert 215 may be secured to blade 200 inanother suitable manner, such as by welding or through the use of anadhesive.

Alternatively, cutting edge 210 may be formed by sharpening, grinding,or otherwise machining the leading side of main body portion 250 ofblade 200.

As exemplified in FIG. 2, cutting edge 210 of blade 200 may extend to orproximate to the inner surface of the sidewall of vessel 100. Anadvantage of this design is that feedstock may be inhibited of fallingdown the sidewall of the vessel to the upper surface of screen 120.Therefore the radial length 219 (see FIG. 3) of blade 200 may be basedon the diameter of vessel 100. For example, the radial length 219 may beequal to the radius of vessel 100 less an allowance for the hub to whichblade 200 is attached and less an amount to position the radial outerend of blade 200 spaced from the inner surface of the sidewall of vessel100. As exemplified, vessel 100 has a diameter of 22 inches and a radiallength 219 of about 8.5 inches, although the cutting edge may be longeror shorter in alternative embodiments. Also, cutting edge insert 215 mayhave a width 217 in the direction of rotation of about 0.87 inches,although the insert 215 may be wider or narrower in alternativeembodiments.

Blade 200 also has a downwardly extending trailing portion 240 providedalong at least a portion of, and preferably along most or substantiallyall of or all of, the trailing side 204. When blade 200 is rotated inits forward direction of rotation, downwardly extending trailing portion240 may generate air turbulence (e.g. localized areas of lower pressure)sufficient to impart an upward force on botanical feedstock positionedon or above screen 120. For example, downwardly extending trailingportion 240 may be configured to produce eddy currents that draw cut andpartially cut feedstock upwardly towards a plane of rotation of thecutting edge 210 of blade 200.

Preferably, downwardly extending trailing portion 240 has a plurality ofdiscontinuities along a radial length of the trailing portion. In theexample illustrated in FIGS. 4 and 5, the lower edge 244 of downwardlyextending trailing portion 240 is generally saw toothed in shape, withfour triangular notches 245 provided along the lower edge 244. Inalternative embodiments, more or fewer notches may be provided. Also,the discontinuities need not be triangular notches, and lower edge 244may have any other suitable shape or profile. For example, lower edge244 may have a profile that is generally sinusoidal in shape.

By providing downwardly extending trailing portion 240 at an angle tothe direction of rotation of blade 200, as the blade is rotated energyimparted to the air can be characterized as a downward ‘pushing’ force.Further, as the downwardly extending trailing portion 240 has aplurality of discontinuities (e.g. a saw toothed or sinusoidal profile),as the blade 200 is rotated the discontinuities generate alternatingregions of higher pressure (proximate the lowermost edge or ‘peaks’ ofthe discontinuities) which may be characterized as ‘higher compressionareas’, and of lower pressure (proximate the uppermost edge or ‘troughs’of the discontinuities) which may be characterized as ‘lower compressionareas’. An effect of these alternating pressure regions is thatbotanical feedstock positioned between blade 200 and screen 120 may beentrained or ‘swept up’ and directed upwardly as air is forced from thehigher compression areas towards the lower compression areas.

For example, as shown schematically in FIG. 6, as blade 200 is rotatedso that the leading side 202 precedes trailing side 204, botanicalfeedstock 10 positioned in the rotational plane 201 of cutting edge 210may be impacted (and cut) by the cutting edge, while botanical feedstock10 positioned above screen 120 and entirely below the plane 201 ofcutting edge 210 may not be impacted by the cutting edge. However, asblade 200 is rotated, air turbulence or a lifting force 20 generated bydownwardly extending trailing portion 240 may impart upward movement onat least some botanical feedstock particles 10 positioned above screen120 that were below the plane 201 of cutting edge 210, such they move toa position in or above the plane 201 of cutting edge 210 and maytherefore be impacted (and cut) by subsequent rotations of blade 200(or, if more than one blade is provided, by another blade 200).Comminuted feedstock particles 12 may pass through apertures 125 inscreen 120 and be directed towards feedstock outlet 114 by gravityand/or an induced air flow (as discussed further below).

In the illustrated example, the depth and width of each notch issimilar, with each notch 245 having a depth 221, a width 224, and anotch angle 225. For example, each notch 245 may have a depth 221 ofabout 0.63 inches, a width 224 of about 1.26 inches, and a notch angle225 of about 90 degrees. In alternative embodiments, downwardlyextending trailing portion 240 may have notches with dissimilar depths,widths, and/or notch angles.

Preferably, downwardly extending trailing portion 240 extends at anangle 230 of between 120° and 150° to the plane of rotation of cuttingedge 210. In the illustrated example, downwardly extending trailingportion 240 extends at an angle 230 of about 135°.

Downwardly extending trailing portion 240 may be secured to blade 200 inany suitable manner. For example, a main body portion 250 and downwardlyextending trailing portion 240 may be cut or otherwise formed as a flatsheet and subsequently bent at fold line 241 to form angle 230. Mainbody portion 250 may then be mechanically fastened, welded, or otherwisesecured to a separately formed cutting edge 210 to form blade 200. Inalternative embodiments, downwardly extending trailing portion 240 maybe formed separately and mechanically fastened, welded, or otherwisesecured to blade 200.

In the illustrated example, main body portion 250 has a radial length220 of about 8 inches, although main body portion 250 may be longer orshorter in alternative embodiments. Also, main body portion 250 has awidth 222 of about 1.97 inches prior to folding (see FIG. 3), althoughmain body portion 250 may be wider or narrower in alternativeembodiments.

After folding, (e.g. as shown in FIG. 4), main body portion 250 has anoverall width 233, which may be about 1.71 inches, or wider or narrowerin alternative embodiments. Also, downwardly extending trailing portion240 may have a height 236 of about 0.56 inches.

Also, in the illustrated example main body portion 250 has a thickness231 of about 0.06 inches (e.g. it may be cut from a sheet of 16 gaugeSAE 304 stainless steel), although main body portion 250 may be thickeror thinner in alternative embodiments.

As exemplified in FIG. 6, blade 200 is mounted above screen 120. In thisarrangement, cutting edge 210 is spaced from screen 120 by a firstdistance 262. Preferably, distance 262 is from about 31 mm to about 54mm. In a preferred embodiment, distance 262 is about 24 mm.

Also, the lowermost portion of lower edge 244 of downwardly extendingtrailing portion 240 is spaced from screen 120 by a second distance 264.Preferably, distance 264 is from about 7 mm to about 30 mm. In apreferred embodiment, distance 264 is about 20 mm.

An advantage of this spacing is that it may reduce crushing and/orshearing of botanical feedstock by the downwardly extending trailingportion 240 as the blade is rotated. Alternatively, or additionally, itmay reduce frictional heat generated in and/or transferred to botanicalfeedstock during comminution. For some feedstocks (e.g. cannabis), thismay be particularly desirable, as one or more components of thefeedstock may be susceptible to thermal degradation and/orvolatilization (e.g. aliphatic aldehydes (nerol, geraniol, octanal,decanal), and/or monoterpenes (limonene, pinenes, ocimenes)).

Feedstock Outlet in Communication with a Source of Negative Pressure

The flowing is a description of the use of negative pressure which maybe used by itself or in combination with one or more of the otherfeatures disclosed herein including the configuration of the cuttingblades, the use of one or more cyclone separators and any of the methodsdisclosed herein.

In accordance with this aspect, feedstock outlet 114 is coupled to aconduit or otherwise in fluid communication with a source of negativepressure.

In accordance with this aspect, the source of negative pressure may beused to reduce the air pressure within vessel 100 to below ambient.Reducing the air pressure within the vessel may have a number ofadvantages. For example, pieces of cut and partially cutfeedstock—including dust and other fine particulate matter generatedduring comminution—may be drawn through the screen and towards andthrough feedstock outlet 114, which may increase the collectionefficiency of the comminution apparatus. Additionally, reducing the airpressure within the vessel may reduce or minimize any loss of fineparticulate matter (e.g. trichomes, terpenes) during comminution. Forexample, dust and other fine particulate matter may be inhibited fromcollecting on interior surfaces of vessel 100. Additionally, oralternatively, dust and other fine particulate matter may be inhibitedfrom exiting vessel 100 through feed port 113 of In addition, comminutedfeedstock may be drawn to downstream equipment for, e.g., separation orfurther processing, without mechanically contacting the feedstock.

Another advantage of feedstock outlet 114 being in fluid communicationwith a source of negative pressure is that botanical feedstock(including pieces of cut and partially cut feedstock) may be drawndownwardly towards the cutting zone or the screen 120.

It will be appreciated that if the blades are configured to cause thefeedstock to rise upwardly from the screen into the cutting zone, thentrailing portion 240 of the rotating blade may be configured to impartan upward force on botanical feedstock positioned between blade 200 andscreen 120 sufficient to overcome the negative pressure and cause thefeedstock to rise.

Directing botanical feedstock towards the rotating blade 200 may improvethe efficiency and/or throughput of the comminution apparatus. Forexample, the apparatus may be able to process a greater amount ofbotanical feedstock per unit time. Also, the apparatus may be able toprocess a given volume of botanical feedstock in less time, which may beparticularly desirable for some feedstocks (e.g. cannabis), one or morecomponents of the feedstock (e.g. aliphatic aldehydes, monoterpenes) maybe susceptible to thermal degradation.

Referring to FIG. 7, an apparatus for comminution of a botanicalfeedstock 1000 is shown with a feedstock outlet 114 in fluidcommunication with a source of negative pressure 300. In the illustratedexample, a separation member 400 is positioned downstream of feedstockoutlet 114 and upstream of the source of negative pressure 300. Asdiscussed further below, in the illustrated example separation member400 is a cyclonic separator. The separation member may be any separationmember which uses changes in the direction of flow of air (e.g., amomentum separator) or changes in an air flow pattern or speed (e.g., acyclone separator) or the like to disentrain feedstock from an airstream.

In the illustrated example, a conduit 502 extends between feedstockoutlet 114 and a fluid inlet 402 of separation member 400, and a conduit504 extends between a fluid outlet 404 of separation member 400 and thesource of negative pressure 300. It will be appreciated that anysuitable conduit may be used, such as a flexible plastic conduit, arigid plastic conduit, a rigid metal conduit, and the like.

The source of negative pressure may comprise any suitable device orapparatus capable of inducing a fluid flow out of feedstock outlet 114.For example, the source of negative pressure 300 may comprise a poweredairflow fan capable of inducing an airflow from an air inlet of thesource of negative pressure 300 to an air outlet of the source ofnegative pressure 300. In such an example, by placing the air inlet ofthe source of negative pressure 300 in fluid communication withfeedstock outlet 114, the source of negative pressure 300 may therebyinduce an airflow out of vessel 100, thereby reducing the pressurewithin vessel below ambient.

In some embodiments, the negative pressure may be from 15 to 29 inHg, 20to 27 inHg, or 22 to 25 inHg.

Feedstock Outlet in Communication with a Cyclonic Separator

The flowing is a description of the use of one or more cycloneseparators which may be used by itself or in combination with one ormore of the other features disclosed herein including the configurationof the cutting blades, having the feedstock outlet in communication witha source of negative pressure and any of the methods disclosed herein.

In accordance with this aspect, one or more cyclone separators may beprovided to separate the feedstock from the air stream.

Another advantage of this aspect is that botanical feedstock (includingpieces of cut and partially cut feedstock and dust) may be separatedfrom an air stream used to convey the feedstock from the vessel 100without further damage to the feedstock. A further advantage is thatmore than one cyclonic separator may be positioned in series in thefluid flow path between the feedstock outlet of the vessel and thesource of negative pressure. Each such cyclone separator may beconfigured to remove different sized particulate matter. For example, afirst stage cyclonic separator may be configured to remove larger orheavier portions of the feedstock and a downstream second stage cyclonicseparator may be configured to remove lighter or finer portions of thefeedstock. Accordingly, the cyclonic separators may be used to producetreated feedstocks having different particle size profiles.

In the example illustrated in FIG. 7, the source of negative pressure300 induces fluid flow from the vessel 100, into and through thecyclonic separator 400. Cyclonic separator 400 may be of any design. Asair travels in the cyclonic separator 400, particulate matter isseparated and an air stream having a reduced level of particulate matterexits the cyclonic separator 400 via a cyclonic separator air outlet.The separated particulate matter may exit the cyclonic separator 400 viaa comminuted particle outlet 406.

As exemplified in FIG. 7, a separated material collection chamber 450 isshown in communication with the comminuted particle outlet 406 ofcyclonic separator 400 to receive particles of comminuted botanicalfeedstock (e.g. particles of comminuted cannabis) dis-entrained from afluid stream (e.g. an air stream) entering fluid inlet 402 of thecyclonic separator 400.

Preferably, the separated material collection chamber 450 is removablefrom the cyclonic separator 400. Providing a detachable separatedmaterial collection chamber 450 may allow a user to transport (e.g.carry) the collected comminuted feedstock (e.g. comminuted cannabis) toanother location for emptying and/or further processing, without needingto carry or move the cyclonic separator 400. Preferably, the separatedmaterial collection chamber 450 is removable as a closed module, whichmay help prevent the comminuted feedstock from spilling out of theseparated material collection chamber 450 during transport.

Alternately, comminuted particle outlet 406 may be in flow communicationwith a conduit which transports the separated particulate matter to,e.g., another piece of equipment for further processing.

Optionally, an additional filter may be provided downstream of cyclonicseparator 400. The additional filter may remove particulate matter fromthe airstream exiting the cyclonic separator 400 that was not removedfrom the incoming airstream to the cyclonic separator 400. For example,as illustrated in FIG. 7, a physical or electrostatic filtration member490 may be provided downstream of the cyclonic separator 400 andupstream of the source of negative pressure 300. Filtration member 490may incorporate a bag, a porous physical filter media (such as foam orfelt), or other physical air treating means.

It will be appreciated that two or more cyclonic separation stages maybe used, each of which uses one or more cyclonic separators 400. Thecyclonic separators 400 of each stage may be the same or different. Thecyclonic separators 400 of one stage may be different to the cyclonicseparators of another stage, although in some embodiments, they may bethe same. As exemplified in FIG. 8, a second cyclonic separator 400 b isprovided downstream of a first cyclonic separator 400 a. A secondseparated material collection chamber 450 b is shown in communicationwith a comminuted particle outlet 406 b of second cyclonic separator 400b to receive particles of comminuted botanical feedstock (e.g. particlesof comminuted cannabis) dis-entrained from the fluid stream exiting thefirst cyclonic separator 400 a.

For example, the fluid stream that exits first cyclonic separator 400 avia fluid outlet 404 a and that is conveyed to fluid inlet 402 b ofsecond cyclonic separator 400 b by conduit 506 has a reduced level ofcomminuted feedstock relative to the fluid stream entering the firstcyclonic separator 400 a via inlet 402 a, due the separation ofcomminuted botanical feedstock (e.g. particles of comminuted cannabis)by first cyclonic separator 400 a, with the separated particles beingcollected in separated material collection chamber 450. Also, the fluidstream exiting second cyclonic separator 400 b via conduit 504 has afurther reduced level of comminuted feedstock relative to the fluidstream entering the second cyclonic separator 400 b via fluid inlet 402b, due the separation of comminuted botanical feedstock (e.g. particlesof comminuted cannabis) by second cyclonic separator 400 b, with theseparated particles being collected in second separated materialcollection chamber 450 b.

Preferably, feedstock particles separated by the second cyclonicseparator 400 b and collected in second separated material collectionchamber 450 b have a smaller average particle size than feedstockparticles separated by the first cyclonic separator 400 a and collectedin separated material collection chamber 450 a. This may be achieved by,for example, providing a second cyclonic separator having a cyclonechamber with a smaller radius than the cyclone chamber of the firstcyclonic separator 400 a. In such a case, particles entrained in theairflow in the second cyclonic separator 400 b will experience a greatercentrifugal force than they experienced in the first cyclonic separator400 a, which may promote the dis-entrainment of smaller particles fromthe airflow in the second cyclonic separator 400 b. Advantageously,collecting finer particles may reduce or eliminate the loss ofstructures (e.g. trichomes) that contain one or more compounds ofinterest.

Separating (and collecting) comminuted feedstock particles havingdifferent average particle sizes may have one or more advantages. Forexample, for cannabis, the smaller particles separated and using secondcyclonic separator may include a greater proportion of trichomes thathave been detached from the plant material fed into the grinder 1000.These trichomes contain resin with a relatively high concentration ofcertain compounds (e.g. cannabinoids) that are typically consideredvaluable. Accordingly, particles collected in second separated materialcollection chamber 450 b may have a relatively higher concentration ofthese compounds than particles collected in first separated materialcollection chamber 450 a. Separating and collecting particles withdifferent relative cannabinoid concentrations may improve e.g. theefficiency of subsequent processing steps (e.g. compound extraction).Alternatively, or additionally, particles with a larger average particlesize (e.g. those separated by first cyclonic separator 400 a) may beused for a first type of further processing (e.g. to produce a‘hashish’-type product of compressed trichomes) and particles with asmaller average particle size (e.g. those separated by second cyclonicseparator 400 b) may be used for a second type of further processing(e.g. a solvent extraction).

General Description of Method of Operating an Apparatus for theComminution of a Botanical Feedstock

The flowing is a description of a method of operation which may be usedby itself or in combination with one or more of the other featuresdisclosed herein including the configuration of the cutting blades,having the feedstock outlet in communication with a source of negativepressure, the use of one or more cyclone separators and any of themethods disclosed herein.

Referring to FIG. 9, there is illustrated a method 700 for operating anapparatus for the comminution of a botanical feedstock, the apparatushaving a vessel, a first feedstock outlet connected in fluidcommunication with a source of negative pressure, and a screenpositioned above the first feedstock outlet. Also, the apparatus has ablade rotatably mounted above the screen and configured to be rotated ina direction of rotation, where at least a portion of a leading side ofthe blade has a cutting edge, and at least a portion of a trailing sideof the blade has a downwardly extending trailing portion with a loweredge having a plurality of discontinuities. Method 700 may be used tooperate apparatus 1000 or any other suitable apparatus for thecomminution of a botanical feedstock.

At 705, a botanical feedstock is introduced into the treatmentapparatus. For example, cannabis may be fed into vessel 100 through afeedstock inlet 112 provided at the upper end 102 of vessel 100.

At 710, the blade of the apparatus is rotated at a rate of rotation inorder to cut the botanical feedstock. Also, at the rate of rotation, thetrailing portion generates turbulence that induces upward movement ofcut and partially cut feedstock from an upper surface of the screen to aplane of rotation of the cutting edge of the blade. For example, theblade may be rotated from between about 750 rotations per minute (RPM)to about 1400 RPM (measured at the drive shaft of the blade), andpreferably at about 900 RPM. Generally speaking, at higher rates ofrotation the turbulence generated by the rotating blade is greater,which may cause cut and partially cut feedstock to be raised into thepath of the cutting edge more frequently, which may improve theefficiency and/or rate of reduction in the size of the feedstock.

Optionally, at 715, the source of negative pressure is activated toreduce the pressure in the vessel to below ambient pressure. Activationof the source of negative pressure also results in a downward forcebeing applied to the cut and partially cut feedstock, as air is drawntowards the feedstock outlet. However, at the rate of rotation, theturbulence generated by the rotation of the blade overcomes the downwardforce, resulting in upward movement of cut and partially cut feedstockto the plane of rotation of the cutting edge of the blade.

For example, the lower edge of the downwardly extending trailing portionof the blade may be generally saw toothed in shape, and at the rate ofrotation, the rotation of the blade may provide lift to the cut andpartially cut feedstock.

Additionally, or alternatively, by rotating the blade at the rate ofrotation, the plurality of discontinuities may produce eddy currentsthat draw cut and partially cut feedstock upwardly to a plane ofrotation of the cutting edge of the blade.

Put another way, the blade may be rotated at a rate of rotationsufficient to effectively ‘neutralize’ a downward force on the cut andpartially cut feedstock that is produced by the negative pressure in thevessel, and provide lift so that the feedstock moves upwardly to a zonein which it is cut or further cut.

As noted above, at the rate of rotation, the trailing portion maygenerate turbulence that induces upward movement of cut and partiallycut feedstock from an upper surface of the screen to a plane of rotationof the cutting edge of the blade. However, as illustrated schematicallyin FIG. 6, despite the induction of upward movement of at least some cutand partially cut feedstock 10 from an upper surface of the screen, thesource of negative pressure may nevertheless draw fine particulatematter (e.g. cut or otherwise comminuted feedstock particles 12) throughthe screen and towards a feedstock outlet of the vessel.

Using the source of negative pressure to draw fine particulate matterthrough the screen may have one or more advantages. For example,inducing or encouraging fine particulate matter towards a feedstockoutlet may increase the collection efficiency of the comminutionprocess. Additionally, it may reduce or minimize any loss of fineparticulate matter (e.g. trichomes, terpenes) during comminution.

For example, particles of feedstock that have been cut or otherwisereduced to a size that allows them to pass through apertures of thescreen may be encouraged to pass through the screen by the airflowgenerated by the source of negative pressure. For example, the negativepressure may be sufficient to draw at least 75% of the fine particulatematter from a volume defined above the blade and through the screen.Advantageously, this may reduce or minimize any loss of fine particulatematter (e.g. trichomes, terpenes) during comminution. For example, dustand other fine particulate matter may be inhibited from collectinginterior surfaces of vessel 100, and/or be inhibited from exiting vessel100 through an openable feed port 113 of feedstock inlet 112.

Optionally, at 720, cut feedstock may be withdrawn from the firstfeedstock outlet and the treated (cut) feedstock may be conveyed to acyclonic separator 400. For example, a cyclonic separator 400 may beprovided downstream of the first feedstock outlet and upstream of thesource of negative pressure.

Optionally, at 725, the fluid stream drawn from the vessel through thefirst feedstock outlet may be subjected to cyclonic separation. Duringcyclonic separation, cut feedstock (e.g. particles of comminutedcannabis) entrained in the fluid stream is separated from the fluidstream, and the separated feedstock is collected in a separated materialcollection region.

Optionally, the cyclonic separation may consist of a single cyclonicseparation stage, e.g. a single cyclone chamber, or two or more cyclonechambers arranged in parallel. Alternatively, a second cyclonicseparation stage may be provided in series with (downstream of) thefirst cyclonic separation stage.

During cyclonic separation, at least some, preferably most, and mostpreferably substantially all of the cut feedstock entrained in the fluidstream is separated from the fluid stream. Where not all of the cutfeedstock is dis-entrained from the fluid stream by the cyclonicseparator, fluid exiting the cyclonic separator will still contain atleast some entrained cut feedstock. Optionally, at 730, a fluid steamhaving a reduced level of cut feedstock obtained from the cyclonicseparator is subjected to further filtration to remove fine particulatematter from the fluid steam having a reduced level of cut feedstock.This further filtration may be a physical filter media to reduce theparticulate level to a level suitable for introduction to the ambient.

General Description of Method of Operating Continuously Operating aBatch Grinder

The flowing is a description of a method of operation which may be usedby itself or in combination with one or more of the other featuresdisclosed herein including the configuration of the cutting blades,having the feedstock outlet in communication with a source of negativepressure, the use of one or more cyclone separators and any of themethods disclosed herein.

Typically, a batch grinder may be loaded with a first quantity ofmaterial to be ground or otherwise comminuted (e.g. a botanicalfeedstock such as cannabis) through an inlet port that is closed afterthe material is loaded. Once loaded, the grinder is operated until allor substantially all of the loaded material is ground. The grinder isthen de-activated to allow a second quantity or ‘batch’ of material tobe ground, and optionally for the ground material from the first batchto be removed.

Referring to FIG. 10, there is illustrated a method 800 for continuouslyoperating a batch grinder. Method 800 may be used to operate grinder1000 or any other suitable botanical feedstock grinder.

At 805, a botanical feedstock is introduced into a vessel of thegrinder. For example, cannabis may be fed into vessel 100 through afeedstock inlet 112 provided at the upper end 102 of vessel 100.

At 810, the vessel is closed and the grinder is operated as a closedvessel under negative pressure. While the grinder is operational, afluid steam containing treated (e.g. comminuted) feedstock is withdrawnfrom the grinder. For example, a source of negative pressure in fluidcommunication with a feedstock outlet may draw particles of feedstockthat have been cut or otherwise reduced in size by the grinder through afeedstock outlet of the grinder. It will be appreciated that the grindermay be any apparatus suitable for comminuting the feedstock.

At 815, while continuing to operate the grinder under negative pressure,a feed port of the vessel may be opened and additional botanicalfeedstock may be introduced into the grinder via the feed port whilecontinuing to draw air from the vessel using a source of negativepressure. Since air is being continuously drawn from the vessel,particles of ground (or unground) feedstock may be inhibited orprevented from exiting the grinder via the feed port. Accordingly,valuable feedstock may not be lost to the ambient while fresh feedstockis added to the grinder with the grinder operating.

Optionally, at 820, the fluid stream drawn from the vessel may beconveyed to a cyclonic separator. For example, a cyclonic separator maybe provided downstream of a feedstock outlet of the grinder and upstreamof the source of negative pressure.

Optionally, at 825, the fluid stream drawn from the vessel may besubjected to cyclonic separation. During cyclonic separation, cutfeedstock (e.g. particles of comminuted cannabis) entrained in the fluidstream is separated from the fluid stream, and the separated feedstockis collected in a separated material collection region. Optionally, thecyclonic separation may consist of a single cyclonic separation stage,e.g. a single cyclone chamber, or two or more cyclone chambers arrangedin parallel. Alternatively, a second cyclonic separation stage may beprovided in series with the first cyclonic separation stage.Accordingly, a first treated feedstock (e.g., the larger comminutedfeedstock) may be collected that is suitable for a particular subsequenttreatment operation (e.g., compressed resin glands (hashish)) and asecond treated feedstock (e.g., the finer comminuted material) may becollected that is suitable for an alternate subsequent treatmentoperation (e.g., extraction).

Optionally, at 830, a fluid steam having a reduced level of cutfeedstock obtained from the cyclonic separator is subjected to furtherfiltration to remove fine particulate matter from the fluid steam havinga reduced level of cut feedstock. This further filtration may be aphysical filter media to reduce the particulate level to a levelsuitable for introduction to the ambient.

General Description of Method for Treating Cannabis

The flowing is a description of a method of operation which may be usedby itself or in combination with one or more of the other featuresdisclosed herein including the configuration of the cutting blades,having the feedstock outlet in communication with a source of negativepressure, the use of one or more cyclone separators and any of themethods disclosed herein.

While the apparatus and methods discussed herein may be suitable for usewith a variety of botanical feedstock, they may be particularly wellsuited for use with a feedstock of cannabis. Referring to FIG. 11, thereis illustrated a method 900 for treating cannabis. Method 900 may beused with any apparatus disclosed herein or any other suitable apparatusfor treating cannabis.

At 905, a feedstock of cannabis is treated and a treated feedstockcomprising comminuted cannabis is obtained. For example, a cannabisfeedstock may be comminuted using apparatus 1000.

At 910, the treated feedstock is pneumatically conveyed to a cyclonicseparator. For example, a source of negative pressure in fluidcommunication with a feedstock outlet of apparatus 1000 may drawparticles of comminuted cannabis to a cyclonic separator. For example, acyclonic separator may be provided downstream of a feedstock outlet ofthe grinder and upstream of the source of negative pressure.

At 915, the air stream drawn from the vessel containing the comminutedcannabis may be subjected to a first cyclonic separation stage. As aresult of the cyclonic separation, a first stream of treated feedstock(i.e. particles of comminuted cannabis) separated out of the air streamis obtained, along with a first fluid stream having a reduced level oftreated feedstock.

Optionally, at 920, the treated feedstock may be subjected to at leastone subsequent cyclonic separation stage in series with the firstcyclonic separation stage. Preferably, each subsequent cyclonicseparation stage separates treated cannabis having a smaller particlesize than the immediately previous cyclonic separation stage.

Additionally, or alternatively, the first fluid stream having a reducedlevel of treated feedstock may be subjected to a second cyclonicseparation stage and a second fluid stream having a further reducedlevel of treated feedstock and treated feedstock separated out of afluid stream by the second cyclonic separation stage may be obtained.Preferably, the treated feedstock separated out of a fluid stream by thesecond cyclonic separation stage has a smaller average particle sizethan an average particle size of the treated feedstock separated out ofa fluid stream by the first cyclonic separation stage.

Optionally, at 925, first stream of treated feedstock exiting thecyclonic separator may be collected. For example, the treated feedstockmay be collected in a separated material collection region of thecyclonic separator.

Optionally, at 930, at least a portion of the first stream of treatedfeedstock may be subjected to extraction to obtain a cannabis extract.For example, treated feedstock collected at 925 may subsequently besubjected to an extraction process (e.g. using a botanical extractor) toobtain a cannabis extract.

For example, as illustrated in FIG. 8, an extractor 600 may be providedto extract one or more compounds (e.g., waxes, heavy oils, or lightoils) from cannabis that has been comminuted using apparatus 1000. Inthe illustrated example, extractor 600 is separate from the cyclonicseparators 400 a, 400 b. Accordingly, the treated cannabis collected inone or both separated material collection regions 450 a, 450 b may betransferred to the extractor As discussed above, comminuted cannabiscollected in chamber 450 b may be transferred to the extractor, andcomminuted cannabis collected in chamber 450 a may be transferred toanother location). For example, where separated material collectionchambers 450 a, 450 b are detachable from their respective cyclonicseparators, a user may transport (e.g. carry) the collected comminutedcannabis in one or both of the detached chambers 450 a, 450 b to theextractor 600.

Alternatively, an inlet to the extractor may be in communication with afeedstock outlet 406 of a cyclonic separator 400, e.g. using a conduit(not shown), such that cannabis removed from an air stream by thecyclonic separator is transferred directly to the extractor.

Returning to FIG. 11, optionally, at 935, a fluid steam having a reducedlevel of cut feedstock obtained from the cyclonic separator is subjectedto further filtration to remove fine particulate matter from the fluidsteam having a reduced level of cut feedstock. This further filtrationmay be a physical filter media to reduce the particulate level to alevel suitable for introduction to the ambient.

As used herein, the wording “and/or” is intended to represent aninclusive-or. That is, “X and/or Y” is intended to mean X or Y or both,for example. As a further example, “X, Y, and/or Z” is intended to meanX or Y or Z or any combination thereof.

While the above description describes features of example embodiments,it will be appreciated that some features and/or functions of thedescribed embodiments are susceptible to modification without departingfrom the spirit and principles of operation of the describedembodiments. For example, the various characteristics which aredescribed by means of the represented embodiments or examples may beselectively combined with each other. Accordingly, what has beendescribed above is intended to be illustrative of the claimed conceptand non-limiting. It will be understood by persons skilled in the artthat other variants and modifications may be made without departing fromthe scope of the invention as defined in the claims appended hereto. Thescope of the claims should not be limited by the preferred embodimentsand examples, but should be given the broadest interpretation consistentwith the description as a whole.

1. A method for treating cannabis comprising: (a) treating a feedstockof cannabis and obtaining treated feedstock comprising comminutedcannabis; (b) pneumatically conveying the treated feedstock to acyclonic separator; and, (c) subjecting the treated feedstock to a firstcyclonic separation stage and obtaining a first stream of treatedfeedstock separated out of a fluid stream by the first cyclonicseparation stage and a first fluid stream having a reduced level oftreated feedstock.
 2. The method of claim 1, wherein step (a) comprisescomminuting at least a portion of the feedstock of cannabis.
 3. Themethod of claim 1, further comprising subjecting at least a portion ofthe first stream of treated feedstock to extraction and obtaining acannabis extract.
 4. The method of claim 1, further comprisingcollecting the first stream of treated feedstock exiting the cyclonicseparator and subsequently subjecting at least a portion of thecollected first stream of treated feedstock to extraction and obtaininga cannabis extract.
 5. The method of claim 1, wherein step (c) furthercomprises subjecting the treated feedstock to at least one subsequentcyclonic separation stage in series with the first cyclonic separationstage, wherein each subsequent cyclonic separation stage separatestreated cannabis having a smaller particle size than the immediatelyprevious cyclonic separation stage.
 6. The method of claim 1 furthercomprising subjecting the first fluid stream having a reduced level oftreated feedstock to a second cyclonic separation stage and obtaining asecond fluid stream having a further reduced level of treated feedstockand treated feedstock separated out of a fluid stream by the secondcyclonic separation stage wherein the treated feedstock separated out ofa fluid stream by the second cyclonic separation stage has a smalleraverage particle size than an average particle size of the treatedfeedstock separated out of a fluid stream by the first cyclonicseparation stage.
 7. The method of claim 1, further comprisingsubjecting the first fluid stream having a reduced level of treatedfeedstock to a physical filtration stage.
 8. The method of claim 1,wherein step (a) comprises comminuting at least a portion of thefeedstock of cannabis, and the method further comprises collecting thefirst stream of treated feedstock exiting the cyclonic separator andsubsequently subjecting at least a portion of the collected first streamof treated feedstock to extraction and obtaining a cannabis extract. 9.The method of claim 8, further comprising subjecting the first fluidstream having a reduced level of treated feedstock to a physicalfiltration stage.